DS2155 datasheet(45/262 Pages) DALLAS

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DS2156

45 of 262

5. SPECIAL PER-CHANNEL REGISTER OPERATION

Some of the features described in the data sheet that operate on a per-channel basis use a special method

for channel selection. There are five registers involved: per-channel pointer register (PCPR) and per-

channel data registers 1–4 (PCDR1–4). The user selects which function or functions are to be applied on a

per-channel basis by setting the appropriate bit(s) in the PCPR register. The user then writes to the PCDR

registers to select the channels for that function. The following is an example of mapping the transmit and

receive BERT function to channels 9–12, 20, and 21.

Write 11h to PCPR

Write 00h to PCDR1

Write 0fh to PCDR2

Write 18h to PCDR3

Write 00h to PCDR4

The user may write to the PCDR1-4 with muliple functions in the PCPR register selected, but can only

read the values from the PCDR1-4 registers for a single function at a time. More information about how

to use these per-channel features can be found in their respective sections in the data sheet.

PCPR

Per-Channel Pointer Register

28h

Bit #

Name

RSAOICS

RSRCS

RFCS

BRCS

THSCS

PEICS

TFCS

BTCS

Default

Bit 0/Bert Transmit Channel Select (BTCS)

Bit 1/Transmit Fractional Channel Select (TFCS)

Bit 2/Payload Error Insert Channel Select (PEICS)

Bit 3/Transmit Hardware Signaling Channel Select (THSCS)

Bit 4/Bert Receive Channel Select (BRCS)

Bit 5/Receive Fractional Channel Select (RFCS)

Bit 6/Receive Signaling Reinsertion Channel Select (RSRCS)

Bit 7/Receive Signaling All-Ones Insertion Channel Select (RSAOICS)

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